Bringing the Exinct Back to Life

http://www.nytimes.com/2013/03/19/science/earth/research-to-bring-back-extinct-frog-points-to-new-path-and-quandaries.html?ref=science&_r=0

This article explains the vision scientists have of reintroducing extinct animals back into the world. They almost succeeded once in 2003, when a goatlike creature was born, but it only lived for a matter of minutes. One way of doing this is by backbreeding, that is breeding a certain species that carries its ancestors DNA together in hopes of eventually breeding a close replica of the extinct creature. Another is to, for example, bring elephants that are resistant to the cold in hopes of creating another wooly mammoth. They don't want to bring back the reptilian dinosaurs, just those that died 200,000 years ago, such as saber tooth tigers, giant ground sloths, and wooly mammoths.

As I find this idea fascinating, I can't help but feel as if this would not be a good idea. There is a reason why they went extinct, and I don't want giants ruling the earth again. Bringing back these monsters of the past will drastically change modern day Earth. To me, this article shows the brilliance of scientists and how they have succeeded. They can create embryos, even if they do die. They have had one success that lasted a few minutes after birth, but that's the start. What worries me is what if they do succeed? When will the stop after their success? Sometimes, I think scientists only focus on the bigger image and doing something huge rather than the reality of the situation.